Method and device for transmitting and receiving D2D signal by relay terminal in wireless access system supporting device-to-device communication

Abstract

Provided are methods for, in a wireless access system supporting device-to-device (D2D) communication, configuring a relay terminal and selecting a link through which the relay terminal can efficiently transmit a D2D signal, and devices for supporting same. A method for effectively transmitting a D2D signal by a relay terminal in a wireless access system supporting D2D communication, according to an embodiment of the present invention, comprises the steps of: receiving relay mode configuration information from a base station; receiving scheduling information about a first resource pool and a second resource pool from the base station; relaying a D2D signal through an access link in the first resource pool; and transmitting the D2D signal through a one-hop D2D link in the second resource pool. The relay terminal is connected to both of the access link and the one-hop D2D link, wherein the access link can be configured for D2D relay communication with the base station, and the one-hop D2D link can be configured for D2D direct communication with another terminal.

What is claimed is: 
     
       1. A method for transmitting a device-to-device (D2D) signal in a wireless access system supporting D2D communication, the method performed by a relay user equipment (UE) and comprising:
 receiving relay mode configuration information from an evolved Node-B (eNB); 
 receiving scheduling information on a first resource pool and a second resource pool from the eNB; 
 relaying a D2D signal via an access link on the first resource pool; and 
 transmitting a D2D signal via a one-hop D2D link on the second resource pool, 
 wherein the relay UE is connected to both the access link and the one-hop D2D link, 
 wherein the access link is configured for D2D relay communication with the eNB, 
 wherein the one-hop D2D link is configured for D2D direct communication with a different UE, 
 wherein the first resource pool and the second resource pool overlap with each other in a prescribed area, and 
 wherein when the first resource pool and the second resource pool overlap with each other, the relay UE is configured to transmit a D2D signal via only the access link or the one-hop D2D link on the first resource pool and the second resource pool. 
 
     
     
       2. The method of  claim 1 , wherein the relay mode configuration information indicates whether the relay UE is used for uplink or downlink. 
     
     
       3. The method of  claim 1 , wherein the first resource pool and the second resource pool are separately allocated from each other in time domain. 
     
     
       4. The method of  claim 1 , wherein when the first resource pool and the second resource pool overlap with each other, the relay UE transmits a D2D signal on the first resource pool and the second resource pool according to (1) a type or priority of D2D data to be transmitted via the access link and the one-hop D2D link, (2) transmission count ratio information between the access link and the one-hop D2D link, or (3) a link at which generated data exists among the access link and the one-hop D2D link. 
     
     
       5. A relay user equipment (UE) for efficiently transmitting a device-to-device (D2D) signal in a wireless access system supporting D2D communication, the relay UE comprising:
 a transmitter; 
 a receiver; and 
 a processor, operatively coupled to the transmitter and the receiver, that: 
 controls the receiver to receive relay mode configuration information from an evolved Node-B (eNB), 
 controls the receiver to receive scheduling information on a first resource pool and a second resource pool from the eNB, 
 controls the transmitter to relay a D2D signal via an access link on the first resource pool, 
 controls the transmitter to transmit a D2D signal via a one-hop D2D link on the second resource pool, 
 wherein the relay UE is connected to both the access link and the one-hop D2D link, wherein the access link is configured for D2D relay communication with the eNB, 
 wherein the one-hop D2D link is configured for D2D direct communication with a different UE, 
 wherein the first resource pool and the second resource pool are overlap with each other in a prescribed area, and 
 wherein when the first resource pool and the second resource pool overlap with each other, the processor further controls the transmitter to transmit a D2D signal via only the access link or the one-hop D2D link on the first resource pool and the second resource pool. 
 
     
     
       6. The relay UE of  claim 5 , wherein the relay node configuration information indicates whether the relay UE is used for uplink or downlink. 
     
     
       7. The relay UE of  claim 5 , wherein the first resource pool and the second resource pool are separately allocated from each other in time domain. 
     
     
       8. The relay UE of  claim 5 , wherein when the first resource pool and the second resource pool overlap with each other, the processor further controls the transmitter to transmit a D2D signal on the first resource pool and the second resource pool according to (1) a type or priority of D2D data to be transmitted via the access link and the one-hop D2D link, (2) transmission count ratio information between the access link and the one-hop D2D link, or (3) a link at which generated data exists among the access ink and the one-hop D2D link.